Polymer Chemistry
·
2018
·Vol. 9
·期 21
·2880-2886
·
IF 4.927
Jiangjun Zhou,Mang Wu,Qiang Peng,Feng Jiang,Haowei Pan,Baoxia Wang,Shengquan Liu,Zhongkai Wang
Three easily performed and efficient strategies for preparing sustainable monomers and polymers derived from renewable fatty acids were investigated. All of these strategies relied on highly efficient esterification between halogenated compounds and fatty acids promoted by 1,1,3,3-tetramethylguanidine (TMG). In strategy 1, fatty acid-derived monomers and polymers were synthesized by TMG-promoted esterification of fatty acids with halogenated compounds followed by polymerization. In strategy 2, TMG-promoted esterification and polymerization reactions were performed in a one-pot process. In strategy 3, TMG-catalyzed esterification between halogenated polymers and fatty acids was conducted to obtain fatty acid-based sustainable polymers. 1H nuclear magnetic resonance and size-exclusion chromatography were used to characterize the as-prepared fatty acid based monomers and polymers. To demonstrate the versatility of these strategies, a series of fatty acid-based monomers was developed using various halogenated monomers. Moreover, reversible addition–fragmentation chain transfer (RAFT) polymerization was performed successfully on the prepared monomers.
研究领域:
材料化学
·
绿色化学
✓ 已验证
DOI
高影响因子
Journal of Renewable Materials
·
2020
·Vol. 8
·期 3
·289-300
·
IF 1.341
Li Qiaoguang,Gong Sheng,Yan Jie,Hu Hongchao,Shu Xugang,Tong Hanqing,Cai Zhiye
The plasticizer is an important polymer material additive. Non-toxic and environmentally friendly plasticizers are developed recently in order to decrease fossil fuel reserves, serious environmental pollution and the toxicity of phthalate esters. In this study, a new, efficient and
environmentally friendly plasticizer of hydrogenated rosin dodecyl ester was prepared by an esterification reaction of hydrogenated rosin and dodecanol. The influences of different reaction conditions (including different catalysts, the catalyst concentration, the ratio of the reactants, reaction
temperature, and reaction time) on the esterification yield are examined and discussed. Hydrogenated rosin dodecyl ester with 71.8% yield was synthesized under the optimized reaction conditions (1:0.8 molar ratio of rosin to dodecanol, 1 mol% tetrabutyl titanate concentration, and 210°C
for 6 h). The esterification reaction is a second-order reaction, and kinetic calculations showed that the activation energy is 39.77 KJ·mol–1. The structure of the hydrogenated rosin dodecyl ester was confirmed by FT-IR spectroscopy and 13C NMR spectrum.
Besides, the thermal stability of target product (hydrogenated rosin dodecyl ester) was also tested by thermal gravimetric analysis (TGA), which showed a good thermal stability.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Catalysts
·
2022
·Vol. 13
·期 1
·40
·
IF 4.501
Qiuyun Zhang,Mengmeng Hu,Jialu Wang,Yanting Lei,Yaping Wu,Qing Liu,Yongting Zhao,Yutao Zhang
In this study, the bimetallic Ni-Zr MOF-derived nickel-zirconium oxide (Ni-Zr-O)-impregnated silicotungstic acid (HSiW) nanocomposite catalyst (HSiW@Ni-Zr-O) was prepared via a hydrothermal procedure followed by a pyrolysis treatment, and its structural, morphological, and surface components and oxidation states were characterized by using XRD, FTIR, TPD-NH3, SEM, TEM, N2physisorption, and XPS analyses. Then, the nanocomposite catalysts were successfully applied to the esterification of oleic acid (OA) with methanol. According to its characteristics, the obtained HSiW@Ni-Zr-O-1 catalyst would generate larger pores, a higher acidity, and active interfaces at the calcining temperature of 300 °C. Therefore, HSiW@Ni-Zr-O-1 exhibits an excellent catalytic activity of 95.2% under optimal reaction conditions. Additionally, the catalyst can be reused with a good catalytic activity after nine cycles. This study highlights the opportunity of using bimetallic MOFs as precursors to the synthesis of highly nanoporous metal oxide, which supports the larger-industrial scale production of biofuels.Keywords:silicotungstic acid;MOF;nickel-zirconium oxide;esterification;biofuels;catalysis
研究领域:
化学工程
·
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
REVIEWS ON ADVANCED MATERIALS SCIENCE
·
2024
·Vol. 63
·期 1
·
IF 3.6
Lulu Zhang,Jing Wang,Qingyi Wang
Size uniformity is a key challenge in the preparation of hydrothermal carbon spheres and a prerequisite for size effect research and many applications of carbon spheres. To solve the scientific problem of low uniformity due to the slow carbonization in traditional preparation of glucose carbon spheres, we propose to add acid/base catalysts to accelerate nucleation, shorten the nucleation time, and improve the size uniformity of carbon spheres. The carbon spheres prepared under base conditions versus acid conditions have higher uniformity and smaller particle size (particle size = 503 nm). This result is due to the faster accumulation of aromatic clusters, shorter nucleation time, and larger number of carbon spheres in alkaline systems. The NaOH-HCSs-based solid acid catalyst as-prepared exhibits excellent catalytic activity, and the esterification rates of levulinic acid and n -butanol maximize to 96.36%.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 17
·4195
·
IF 4.2
Yu Wang,Zhimin Yang,Xichang Wu,Wenxuan Quan,Qi Chen,Anping Wang
In the present study, an acid catalyst (UiO-66-SO3H) with Brønsted and Lewis acid sites was synthesised for the preparation of highly efficient biodiesel from oleic acid and methanol using chlorosulphonic acid sulfonated metal–organic frameworks (UiO-66) prepared with acetic acid as a moderator. The prepared catalysts were characterised using XRD, SEM, FT-IR and BET. The catalytic efficiency of the sulfonated catalysts was significantly improved and successful sulfonation was demonstrated by characterisation techniques. Biodiesel was synthesised by the one-pot method and an 85.0% biodiesel yield was achieved under optimum conditions of the reaction. The esterification reaction was determined to be consistent with a proposed primary reaction and the kinetics of the reaction was investigated. A reusability study of the catalyst (UiO-66-SO3H) was also carried out with good reproducibility. In conclusion, the present study provides some ideas for the synthesis of catalysts with high catalytic activity for the application in the catalytic preparation of biodiesel.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Mianzhang Zhang,Zixin Huang,Pallavi Jayavanth,Ziming Luo,Hua Zhou,Caihuan Huang,Shiyi Ou,Fu Liu,Jie Zheng
Esterification of anthocyanins with saturated fatty acids have been widely investigated, while that with unsaturated fatty acids is little understood. In this study, crude extract (purity ∼ 35 %) of cyanidin-3- O -glucoside (C3G) from black bean seed coat was utilized as reaction substrate, and enzymatically acylated with unsaturated fatty acid (oleic acid). Optimization of various reaction parameters finally resulted in the highest acylation rate of 54.3 %. HPLC-MS/MS and NMR analyses elucidated the structure of cyanidin-3- O -glucoside-oleic acid ester (C3G-OA) to be cyanidin-3- O -(6″-octadecene)-glucoside. Introduction of oleic acid into C3G improved the lipophilicity, antioxidant ability, and antibacterial activity. Further, the color and substance stability analyses showed that the susceptibility of C3G and C3G-OA to different thermal, peroxidative, and illuminant treatments were highly pH dependent, which suggested individual application guidelines. Moreover, C3G-OA showed lower toxicity to normal cell (QSG-7701) and better inhibitory effect on the proliferation of HepG2 cells than C3G, which indicated its potential anti-tumor bioactivity.
研究领域:
食品科学
·
生物化学
·
营养学
✓ 已验证
DOI
PubMed
高影响因子
Royal Society Open Science
·
2019
·Vol. 6
·期 8
·
IF 2.515
Ran Liu,Ke Zhang,Chen Liu,Yanhui Hu,Lilong Zhou,Juan Zhang
Four kinds of functional ionic liquids (ILs) ([C3SO3Hnmp]HSO4), 1-(3-sulfopropyl)-1-methylpyrrolidone phosphate ([C3SO3Hnmp]H2PO4), 1-(3-sulfopropyl)-1-methylpyrrolidone p-toluene sulfonate ([C3SO3Hnmp]CH3SO3H) and 1-(3-sulfopropyl)-1-methylpyrrolidone methyl sulfonate ([C3SO3Hnmp]C6H6SO3H)) were prepared and the catalytic activity of these ILs during esterification of carboxylic acids (formic acid, acetic acid, propionic acid, butyric acid) with alcohols was investigated. The results indicated that the IL ([C3SO3Hnmp]HSO4) exhibited an optimal catalytic performance. And then the IL ([C3SO3Hnmp]HSO4) was immobilized to the silica gel. The immobilized IL performed more excellent catalytic activity than the unsupported [C3SO3Hnmp]HSO4. The effects of reaction temperature, reaction time, molar ratio of acid to alcohol and catalyst dosage were investigated. The response surface methodology based on the Box–Behnken design (BBD) was used to explore the best reaction condition of different experimental variables. Accordingly, a high n-butyl butyrate yield of 97.10% under the deduced optimal reaction conditions was obtained, in good agreement with experimental results and that predicted by the BBD model. The immobilized IL [C3SO3Hnmp]HSO4 maintained high catalytic activity after five cycles.
研究领域:
化学工程
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Biao Lu,Zhaowei Wu,Lijuan Ma,Xia Yuan
Phosphotungstic acid (HPW) was immobilized on a sulphonic-acid-functionalized SBA-15 mesoporous molecular sieve through a one-step hydrothermal synthesis method, using non-ionic surfactant pluronic P123 as a structure-directing agent in acidic media, tetraethoxysilane (TEOS) as a silicon source and 3-trimethoxysilyl-1-propanethiol (MPTMS) with hydrogen peroxide (H 2 O 2 ) oxidized to a sulfonic acid group. The obtained composite material HPW-SBA-15-SO 3 H has a high specific surface area, large pore volume and increased strong acidity. The effect of raw-material ratio on the catalyst was investigated. Catalysts that were prepared under optimal conditions of a molar ratio of (MPTMS)/ (MPTMS + TEOS) of 1:10, a molar ratio of (H 2 O 2 )/(MPTMS) of 18:1 and a mass ratio of (HPW)/(TEOS) of 1:10 exhibited an excellent catalytic activity in the esterification reaction of cyclohexene with formic acid. The cyclohexene conversion exceeded 86.7% and the cyclohexyl formate selectivity was 98.1% after 6 h at 353 K with a mole ratio of cyclohexene to formic acid of 1:3 and a catalyst dosage of 5.7% (w/w). The composite catalyst had a higher catalytic stability than the sulfonic-acid-functionalized SBA-15 and SBA-15-immobilized HPW individually. The cyclohexene conversion reached 72.0% even after reused four times. Fourier transform infrared and temperature-programmed desorption of ammonia revealed that a strong interaction existed between the sulfonic-acid group and the HPW, which prevented acid-active component of HPW and sulfonic-acid group loss from the carrier.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2015
·
IF 3.453
Mengli He,Jun Xu,Zhong-Hua Ma,Hong Yuan,Jingzhong Ma
Mesoporous fluoropolymers with excellent hydrophobicity and acidity (H-PDVB-x-SSFAI) were solvothermally prepared by radical polymerization of perfluoroalkyl sulfonyl imide and divinylbenzene. The formation of mesopores depended on the synergy effect between nano-CaCO 3 porogen and watered solvothermal media. The amount of doped water, and reactant ratio as well, was responsible for the textural properties. The fluoropolymers catalyzed the esterification of long-chain fatty acids with ethanol affording the conversion of 95%, along with TOF of 30.5 h −1 (31.9 h −1 reported for H 2 SO 4 ). The high efficiency was attributed to its excellent hydrophobicity, wettability for ethanol, and acidity. Stability trial evinced that the fluoropolymers were sufferable to 24 h water-boiling with 86% acid groups remained. These are promising recyclable fluoropolymers, maintaining fairly stable catalytic activity for esterification of acetic acid with pentanol at least 7 runs.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Oleo Science
·
2016
·
IF 1.108
Ping Wang,Shangde Sun
Castor oil methyl ester is a kind of biodiesel from castor oil. However, in those previous methods for biodiesel preparation using castor oil as feedstock, glycerol was the main by-product, which had a strong blocking effect on the immobilized enzyme activity and affected the mass transfer of reaction system. For avoiding the negative effect of glycerol on the enzymatic esterification, biodiesel was prepared using ricinoleic acid (RA) as acyl donor. Enzyme screening was also studied, and the effects of reaction temperature, molar ratio of ricinoleic acid and methanol, enzyme load, and reaction time, on the preparation of castor methyl ester were also evaluated. Response surface methodology (RSM) was used to optimize the interaction effect of reaction variables (reaction temperature (30-70°C), enzyme load (2-7%; relative to the weight of total substrates), molar ratio of methanol to ricinoleic acid (2:1-10:1), and reaction time (0.5-2.5 h)) on the acid value (AV) and the degree of esterification (DE). Validation of the RSM model was verified by the good agreement between the experimental and the predicted values of AV and DE. The optimum preparation conditions were as follows: reaction temperature, 48.2°C; enzyme load, 5.8%; molar ratio of methanol to ricinoleic acid, 5.56:1; reaction time, 2.36 h. Under these conditions, the AV and DE of the esterification reaction are 10.36±1.05 mgKOH/g and 94.03±0.60%, respectively. The relationship between initial reaction rate and temperature was also established, and the activation energy (Ea) of the enzymatic esterification is 33.87 KJ/mol.
研究领域:
生物化学
·
可再生能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2015
·
IF 1.098
Yu Niu,Fuying Li,Kai Yang,Ting Qiu,Renzhang Wang,Cheng Lin
A unique Rh/TiO 2 solid acid catalyst modified with H 2 SO 4 was synthesized and evaluated in the esterification reaction of propylene glycol methyl ether and decomposition of methyl orange (MO) in aqueous phase under halogen lamp irradiation. For this purpose, rhodium (Rh) nanoparticles were loaded on SO 4 2 − /TiO 2 via the photo-deposition method. It was found that SO 4 2 − /Rh–TiO 2 exhibited stronger catalytic activity than SO 4 2 − /TiO 2 . The new catalysts were characterized by X-ray powder diffraction (XRD), Brunauer–Emmett–Teller (BET), Transmission electron microscopy (TEM) and high-resolution (HRTEM), X-ray photoelectron spectroscopy (XPS) and Fourier Transform infrared spectroscopy (FTIR). Results from XRD and BET show that SO 4 2 − /Rh–TiO 2 has higher specific surface area and smaller pore size than SO 4 2 − /TiO 2 . The distribution of loaded Rh was found to be uniform with a particle size of 2–4 nm. Data from XPS reveal that Rh primarily exists as Rh 0 and Rh 3 + in Rh–TiO 2 and SO 4 2 − /Rh–TiO 2 . These valence forms of Rh likely contribute to the enhanced catalytic activity. Furthermore, FT-IR spectra of the catalysts show an abundance of surface hydroxyl groups, which help the formation of hydroxyl radicals and the enhancement of surface acid density. The results show that more acid sites are formed on the sulfated Rh–TiO 2 , and these acidic sites are largely responsible for improving the catalytic performance. This superior SO 4 2 − /Rh–TiO 2 catalyst has potential applications in reactions requiring efficient acid catalysts, including esterification reactions and waste water treatment.
研究领域:
材料科学
·
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Zuowang Wu,Chong Chen,Lei Wang,Hui Wan,Guofeng Guan
A magnetically recyclable catalyst was prepared by embedding magnetic nanoparticle in poly(phosphotungstate-based ionic liquid) matrix. The obtained hybrid material was characterized by XRD, FT-IR, SEM, TEM, TGA, and VSM. The results indicated that Fe3O4 was successfully implanted in multilayer poly(ionic liquid), and the catalyst possessed open active sites (see SEM) to reactants and a high magnetization value. The combination of poly(ionic liquid) matrix with magnetic nanoparticle enhanced the structure stability and favored the separation performance. Esterification of oleic acid with ethanol was conducted in the presence of prepared catalyst, and the Box–Behnken response surface methodology was applied for maximizing the oleic acid conversion by optimizing process variables at 90 °C. Under the optimum conditions (reaction time, 5 h; catalyst amount, 13 wt %; alcohol/acid molar ratio, 12:1), the conversion of oleic acid reached 93.4%. Besides, the catalyst presented fine reusability after six runs and could be facilely recovered in magnetic field based on its superparamagnetism property.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）